Armored compressor for refrigerating equipment



Sept. 10, 1957 L. FRIGGERI 2,805,817

ARMORED COMPRESSOR FOR REFRIGERATING EQUIPMENT Filed April 14, 1955 2 Sheets-Sheet l INVENTOR. A 0/5 FZP/GGEE/ z y/w w ATTORNEY Sept. 10, 1957 FRIGGERI 2,805,817

ARMORED COMPRESSOR FOR REFRIGERATING EQUIPMENT Filed April 14, 1955 2 Sheets-Sheet 2 INVENTOR. z w: Ffi/Gt'fi/ ATTOIQA/E) niwd St taPa fQT ARMORED COMPRESSOR FOR REFRIGERATING EQUIPMENT Luis Friggeri, Buenos Aires, Argentina Application April 14, 1955, Serial No. 501,389

1 Claim. (Cl. 230-58) The present invention refers to an armored compressor for refrigerating circuits and more particularly to a new operating sealed unit which, in the manner in which both the essential parts of the motor are mounted in respect to the housing, constitutes a solution to the problem created in this sort of equipment.

In effect, notwithstanding that these sealed compressors are most acceptable due to the safety involved in the confinement of the refrigerating gas in the circuit, serious drawbacks are encountered when any damage occurs in the interior, as the opening of the sealed unit represents the disconnecting of all the essential elements which require revision and special adjustment, which is very complicated.

These damages are not very frequent in the compressor itself and other means which constitute the mobile part as, operating in oil, they work with absolute regularity without greater Wear and tear than that which may originate in the pistons; but this security does not comprise the stator of the motor which, on the contrary, is exposed to the dissolvent and corrosive action of the oil and refrigerating gas in the circuit. This action is specially noticeable on the enamel of the wire constituting the winding, ligaments of same, cardboard separators, etc.

Thus, the ideal would be to free the motor from the housing of the compressor, so that in case of any damage the container need not be opened; but since it is impossible to maintain hermeticity through the rotating parts, that is, the axis of the rotor, the only manner would be that of separating the static parts from the mobile ones by means that do not affect the specific function of the combined elements.

This precisely is what has been obtained with the system of the present invention which will obviate the only serious inconveniences encountered in these armoured equipments. U

The stator is thus separated in respect to the rotor in such a manner that this last mentioned part may form part of the connected elements enclosed in the armored unit; whilst the stator remains in free access from the exterior through simple dust-proof covers, all of which without loss of magnetic relation between the two essential parts of the motive power.

To this end the housing comprises the compressor and possesses a lateral extension embracing precisely the rotor of the motor, the axis of which is mounted in the armored interior. The wall of said extension being of a revolving structure, adapts exteriorly the stator in such a manner that its nucleus remains encircled in respect to the rotor through said wall which does not affect the magnetic influence, which means that, although separated by a partition, both parts of the motor act as a current unit in operating the piston of the compressor proper.

This means that the stator is separable from the rotor, without interference in the armored housing, thus maintaining hermeticity during an unlimited period, as the contained elements are favoured by the lubrication oil contained as in a crank case.

For a greater clearness of the object of this invention, it has been illustrated with several drawings in which:

Fig. 1 is a section of the armored unit showing the confinement of the compressor and rotor of the motor only, as the stator surrounds this last mentioned piece, acting by magnetic influence through the walls of said housing.

Fig. 2 is a transversal section of the unit showing the part corresponding to the motor, the rotor being enclosed in the armored housing, whilst the stator surrounds the former with its proper dismountable cover.

Fig. 3 is a graphic drawing of the manner in which the stator may be dismounted in order to repair or change same in case of damage.

In the different drawings the same reference numbers indicate equal or corresponding parts, the various elements being indicated by letters.

As may be seen in the drawings, a is the armored housing which, as usual encloses a compressor b having a cylinder 1 and corresponding piston 2, a rod 3 of which is reciprocated by eccentric 4 of shaft 5 mounted on bearings 6 within the same housing. Said shaft 5 corresponds to rotor 7 of the motor 0.

The motor 0 has its stator 8 disposed in a special manner, as it is separated from rotor 7 by means of wall 9 of the housing a, this wall forming an extension surrounding rotor 7, whilst said wall 9 serves as bed plate for adapting Isaid stator 8.

The wall 9 is of slight thickness, and as may be noted there is a minimum clearance between rotor 7 and the internal faces of said wall, so that it is able to receive fully the magnetic influence of stator 8 as in an ordinary motor, the stator being concentric with the body of rotor 7.

Stator 8 is independent of the contents of housing a only rests on same by adaptation and embracement around walls 9; and as protector, stator 8 possesses a dust-proof cover 10 which is fixed with screws or other means of easy handling, so that said cover 10 may be easily removed in order to gain access to the stator which is also removable from the rest of the motor, as graphically shown in Fig. 3.

The armored housing a contains a load of oil so that by splashing or other means, constantly lubricates the mobile part of the unit enclosed in said housing.

Cylinder 1 possesses a valve chamber 11 to which are connected the admission and impellent tubes 12 and 13 corresponding to the refrigerating circuit where the refrigerating gas circulates.

In this manner the sealed unit can act as any other in the refrigerating circuit to which it is applied; with the advantage that the oil and the gas cannot attack or affect the wires and component elements of stator 8, for these are absolutely independent from the interior of housing a.

Furthermore, due to any cause or damage to the stator, same may be easily repaired by only lifting cover 10 and thereafter withdrawing the stator as shown in Fig. 3.

With the same case with which the stator is dismounted, the same one or another one relacing it can be mounted, placing it around walls 9 which are, as stated, free within the interior of the housing a with respect to the stator, but maintaining the magnetic relation for the operation of the motor with which axis 5 operates piston 2 of compressor b.

Undoubtedly when carrying out this invention, modifications may be presented in what refers to details of construction, without this implying a departure from the scope of the fundamental principles clearly stated in the following claim.

I claim:

An electric motor-operated armored compressor for refrigerating equipment comprising a housing having a cylinder and a piston operable therein, axially-aligned r 3 'bearing's'in saidliousing, "a "shaft journaled in said bearings, an 'eccenn'ic on -'said shaft, 'a 'piston rod operated by said eccentric and connected to said piston, a valve chamber mounted on said housing above said cylinder, an wlectricjotor fixed tosaid shaft, said 'housing having a thinwallextension integrally formed thereon, said exten- Sibn concentric with and enclosing -'said rotor and being i'n fiuid communication With'the cylinder part of thehous ing, one of 'said"bearings"being mounted on the outer-end -of said extension, "a'stator slide fitted upon the integral extension and a dust-proof "cover'slide fitted upon said integral extension and over said stator.

References Cited in the file of this patent UNITED STATES PATENTS Whitney July 4, 1950 Peters Aug. 1, 1950 Brooks Aug. 15, 1950 Pezzillo V V Aug. 18, 1953 Guyer Feb. 16, 1954 Litzenberg June 7 1955 White July 19, 1955 Zimsky Nov. 29, 1955 

